Carburetor



Jam-5, 1932. s Y 1,840,295

CARBURETOR Original Filed Dec. 29, 1924 2 Sheets-Sheet 1 WITNESSATTORNEY A. M. SMILEY Jan. 5 1932.

- CARBURETOR 2 Sheets-Sheet 2 0 u m i I m v d m 7 V Z. T -kv/ 6 5 a 6.74 4. JP; 2 l/ i 0 J J a s x ANN. V L. V H fi 3 d F /7 1/ l 6 WITNESS:

' of Figure 2.

Patented Jan. 5, I932 UNITED STATES PATENT." orrlce ALFRED M. SMILEY, OICHICAGO, ILLINOIS, ASSIGNOR TO ALFRED M. SMILEY, JAMES B. KILLIAN, FRANKMARRIOTT, THOMAS E. BURNS, LOUIS M. SIPPEL, ROBERT BEN- NINGER, AND PANYLEON M. FEIGENBAUM, DIRECTORS OF ST. LOUIS CARBURETOB COM- CARBURETORApplication filed December 29, 1924, Serial No.

..- the engine. l d

Another object is to provide a carburetor in which both air and fuel arecontrolled in a. novel manner to provide the desired mixture.

Besides the above, my invention is distinguished in the novel manner ofcontrolling the fuel at low and high speed.

WVith these and other objects in view, the invention will be betterunderstood from the following description taken in connection with theaccompanying drawings, in which: I Fig; 1 is a side elevation of thecarburetor;

Fig. 2 is a vertical sectional view on the line 2-2 of Figure 1; and

Fig. 3 is a sectional view on the line Again referring to the drawings,the numeral 1 designates a valve structure comprisingthe body 2, inwhich is arranged a low speed port 3, a high speed port 4 and an outletduct 5, which intercommunicate but are accurately controlled by valvesnow to be described. The communication between the 7 port 3 and outlet 5is accurately controlled by the manually adjusted low speed needle valve6 while communication between outlet 5 is controlled by a valve 7carried by a stem 8 attached to a collar 9. This collar 9 has a camaction with the cam 10 carried by the stem 11 that has an adjustableconnection 12 with the bell crank'13. This bell crank is connected to-any suitable form of accelerator by the control rod 14. The bell crank13 is connected with the usual butterfly valve 15.-

The outlet 5 is controlled by the needle valve 16 connected to a plunger17 that is guided in the passage 18 by the spider 19. This plunger 17has connected thereto a disk valve 20 normally closing the venturi atthe 758,713. Renewed May 3, 1929.

restricted portion through the action of the spring 21.

The lower portion of the casing constitutes an air inlet 22 controlledby the disk valve 23 carried on the sleeve 24 that is slidably mountedon the tube 25 and normally held seated by the spring 26. The tube 25connects with the gasoline supply for conveying gasoline through theports 3 and 4.

In the operation of the carburetor, the needle valve 6 is set at itsmost advantageous position so that upon the slight opening of the valve15 and turning over of the motor gasoline will be sucked through theport 3.

The suction action of the engine lifts the valve disk 20 and therebyopens the outlet 5 so that the gasoline from port 3 may pass through theoutlet and through the passage to strike upon the under surface of thevalve disk and thereby be scattered and mixed with the ingoing airentering at port 22. The

7 lift of the disk 20 controls the opening of the valve 16 and the flowof fuel therethrough. The fuel escapes at the top of the passage 18 intothe draft of air caused by the suction of the engine. This takes placeat the throat of the venturi where the air is expanding, andvaporization of the fuel is promoted thereby. vaporization is furtherromoted by the use of a heating fluid passe into the heating chamber 27that surrounds the venturi so as to heat the fuel and air as they passtherethrough. As this suction action is taking place, the air is drawnthrough the air the port 4 and inlet 22 and around the valve to passstraight through the carburetor and be immediately mixed with the fuel,as above described. Upon the operation of the accelerator to increasethe speed of the motor, the cam 10, through its connections, will givemovement to the stem 8 and thereby unseat the valve 7 to allowadditional fuel to pass through the port 4 and through the outlet 5. Ofcourse, it will be understood that upon the acceleration of the engine,the suction action will be increased, giving greater movement to thevalve 23 and allowing additional air to enter.

It will be seen that this invention provides a carburetor in which themixture is controlled for all speeds of the engine simply by operates inthe, main air inlet port and is yieldingly controlled so that theamount'of air admitted depends upon the strength of the suction and,therefore, upon the demands made on the engine. The suction alsocontrols" the operation of the valve 16 to admit fuel to themixingchamber; Thus, the amount of fuel and of air is controlled by thestrength of the suction. It is, of course, clear that the proportions ofthe air and fuel inlets can be so arranged that any desired variation in1 varying mixture can be obtained with the strength of the suction.

. The mixture is further controlled by the valve'7, which is operated inaccordance With the operation of the throttle valve. This valve, Whichadmits additional fuel, is, therefore, also controlled in accordancewith the demands made upon the engine.

. While this device'has been described as a unitary device, it is clearthat some sub-combinations may be found useful by themselves ,Withoutother parts of the combination. The. use of such sub-combinations iscontemplated by the present invention. Itis further obvious that variouschanges may be made, Within the scope of the appended claims, in thedetails of construction Without departing from the spirit of thisinvention. It is, therefore, to be understood that this invention is notto be limited to the specific details shown and/ordescribed.

Having thus described my invention, What I: claim is:

1'. In; a, carburetor, in combination, a throttle valve, meansfor-controlling said throttle valve, aventurileadmg to said throttlevalve having an air inlet port, a suction controlled valve for saidport, a suction controlled fuel valve embodying means disposed at the restricted portion of said venturi for controlling the passagetherethrough, a manually regulated fuel valve communicating With saidsuction controlled fuel valve, another fuel valve communicating Withsaid suction controlled fuel valve, operating means for said lastmentloned fuelvalve connected to the operating means for the throttlevalve and operable therewith. I

i 2. In a carburetor, in combination, a throttle valve, a venturileadingto said throttle valve and having an air inlet port, a suctioncontrolled valve for said port, a casing forming a heating chamberaround said venturi at the restricted portion thereof, a valvecarstructure embodying a. fuel passage terminating at the restrictedportion of said venturi, a suction controlled memberincludinga fuelvalve disposed in said fuel passage and a mixture passagecontrollingvalve disposed at the restricted portionof said venvalve for said saidair inlet port, asuction controlled valve for said inlet port mounted onthe fuel inlet 3i 3e a venturi in said casin extendin aWa from said airinlet port, a valve carrying structure in said'venturi 'at the end ofsaid fuel inlet pipe, a suction controlled: valve member in said Valvecarrying structure embodying means controlling the passage of fueltherethrough and means regulating the passage throughthe venturi, amanually regulated fuel valve cooperating With said first mentioned fuelvalve having a relatively small port, another fuel valve parallel withsaid last mentioned fuel valve, control. means for this last fuel valveoperatively connected tothe control means for said throttle valve.

4. A carburetor comprising a throttle valve, means for operating saidthrottle valve, a venturi leading to said throttle valve embodying anair inlet port, a suction. con trolled valve for said air inlet port, a.valve carrying structurein said venturi, a pair of fuel valves in saidvalve carrying structure controlling the passage of the fuel to. acooperating suction controlled valve, one ofthe pair of fuel valvesbeing adapted to be open at all times and embodying means for manualregulation, the other of said fuel valves. embodying means whereby theoperation thereof is controlled by'means operated by the operating meansfor said throttle valve.

5. Ina carburetor, in combination, a throt: tle valve, controlling meansfor'said throttle valve,.a venturi leading to saidthrottle valve havingan air inlet port, a suction controlled port, a valvev carryingstructure in said venturi embodying a fuel passage, a suction controlledfuel valve in said passage, means on said valve controlling the passagethrough said venturi at the restricted portion thereof, a manuallyregulated low speed fuel valve in said valve carrying structure,communicating with said suction con trolled valve, a high speed fuelvalve in said valve carrying structure communicatingwith said suctioncontrolled valve, a link connected tosaid operating means for saidthrottle valve,-a cam on said link, a follower on said high speed fuelvalve adapted to engage said cam whereby said fuel valve Will besimultaneously operated With saidthrottle-valve, and means forsimultaneously operatingthe operating means for the throttle valve and.an operating means, for a. high speed fuel valve.

6. In a device of the class described, in combination, a throttle valve,a venturi having an air inlet port, a suction controlled valve for saidair inlet port, a structure embodying a fuel passage, a suctioncontrolled valve in said fuel passage having means disposed at therestricted portion of said venturi for controlling passage therethrough,a manually regulated fuel valve, another fuel valve operatedsimultaneously with the throttle valve, said fuel valves communicatingwith a suction controlled valve in the fuel passage, said throttle valvecontrolling the suction through said venturi whereby said suctioncontrolled valves are regulated.

7. In a carburetor, a throttle Valve adapted to control the suctionthrough the carburetor, a fuel duct, a suction-controlled fuelregulating valve in said duct, a fuel valve adjustable to a fixedsetting adapted to regulate flow of fuel to said duct, athird fuel valvemovable to regulate flow of additional fuel to said duct, connectionsadapted to move said third fuel valve in accordance with the movement ofsaid throttle valve, and a yielding air inlet valve adapted to regulatethe flow of air through the carburetor.

8. In a carburetor, a fuel outlet duct, a fuel supply, a valve connectedwith said supply and adjustable to a fixed setting adapted to regulateflow of fuel to said duct, means for locking said valve in its fixedadjustment, a second valve having a separate connection with said supplyand movable to regulate flow of additional fuel to said ductindependently of said first valve, means for moving said second valve inaccordance with the demand for fuel and a suction controlled outletvalve for said duct.

40 9. In a carburetor, a fuel supply, means providing a fuel duct havingthree passages opening therefrom one of which provides a fuel outletpassage and the other two being connected with said supply, a valve inone of said supply passages adjustable to a fixed setting to regulateflow of fuel to said duct, a second valve in said other supply passageand movable to regulate flow of additional fuel to said duct, means formoving said sec- 0nd valve in accordance with the demand for fuel, and asuction-controlled valve in said outlet passage.

In testimony whereof I afiix my signature.

ALFRED M. SMILEY.

